Please can someone help me ?

Hey ! So I joined this site hoping to get help , so im due on my period around about now (yesterday/today/tommorow) and I still haven't come on ! My breasts have been hurting (predomantly one ) for the past week . I also have had excess discharge ...like a the thick White kind . Yesterday and today I kept getting waves of sickness bug that could be just general sickness sincd my sister wasn't well either . I did a test two days ago and it was negative however I did the test at about 7pm ! Could I be pregnant or is it something else ?